This comprehensive dataset encompasses records of mortgages classified as 30–89 days delinquent across the United States at the county level, spanning from January 2008 to June 2021. These delinquent mortgages represent a specific stage of payment default, where homeowners have fallen behind on their mortgage payments for a period ranging from 30 to 89 days past the due date. Lenders typically report delinquencies in stages, starting at 30 days past due and progressing to 60, 90, and beyond. Being 30–89 days delinquent does not yet categorize the loan as severely delinquent or in default, but it serves as an early warning sign that the borrower is facing challenges in making timely payments. This dataset offers valuable insights into regional trends and patterns in early-stage mortgage delinquencies, making it a valuable resource for economic analysis and policy formulation.